Attachment for pipe-threading machines



May 29, 1923.

H. LYNCH ATTACHMENT FOR PIPE THREADING MACHINES Filed Dec. 22, 1921 Patented May 29, 1923.

UNITEDVSTIATES HARRY LYNCH, OFDES MOINES, IQVVA.v

ATTACHMENT FOR PIPE-THREADING MACHINES.

Application filed December 22, 1921. "Serial No. 524,153.

To all who've-z t may concern: Be it known that I, HARRY LYNCH, a citizen of the United States, and a resident of Des Moines, in the county of Folk and State of Iowa, have. invented a certain new and useful Attachmentfor Pipe Threading Machines, ofwhich the following is a specification. p I

The object of my invention is to provide an attachment of very simple and inexpen sive construction adapted: to be combined with a pipe threading machine and an ordinary ratchet wrench structure, whereby an inexpensive pipe threading device may be equipped with .a ratchet operating means of efficient structure at a very small expense. With this and other objects in View, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby "the objects contemplated are attained, as herein-after more fully set forth, pointed out in my claims. and illustrated'in the accompanying drawings, in which:

Figure 1 shows a .perspective view of a pipe threading device equipped with an attachment and a ratchet wrench, the attachment and combination embodying my invention.

Figure 2 shows a front elevation of the device installed on a pipe; and

Figure 3 shows a detailed, sectional view through the ratchet structure.

Pipe threading devices are made in different forms. I have illustrated one ordinary form of such a device in my drawings, and have used the reference numeral 10 to indicate generally the tubular body thereof.

Mounted in the body 10 are set screws 11, for fastening the body to a pipe. when the pipe is inserted into the body. The interior of the body is screw-threaded and receives an externally screw-threaded tubular member 12, forming part of what is ordinarily called the die head.

Fixed to the outer end of the screwthreaded tubular member 12 is the taper pin plate 13. Rotatably but non-slidably mounted on the body 10 is an annular plate or ring 14, from which the tapered pins 15 project upwardly through corresponding holes in the plate 13 of the die head.

On the upper surfaceof the plate 13 are ribs or the like 16 in which are formed slots 17, which contain the die segments 18. Projecting from the plate 13 on opposite sides may be a piece of pipe or otherwise. In cutting a thread'on the end ofa pipe to. receive the inner ,zendof'ahandle,,which the die head-is screwed to its outer'limit vof. movement; the end of the, pipe is inserted through the tubular :body 10 until one end is adjacent to the die segments-18.

' The'handle inserted into the tubular ber 19 is then operated for rotating thedie head, which will thus be screwed intothe body 10. As the ends of the die segments i8 reach the end of the pipe. the threads will be cut in the outer surfaceof the pipe, as-

the plate 13moves toward the body-1O by thereof are the tubular members 19 adapted-'- virtue of themovement of the screw-- threaded tubular member 12 intosaid'body.

The par-ts heretofore described are of ordinary construction. and in themselves dofnot form my present invention. I

. IW-ith a device of the .kind mentioned, it is necessary to use handles uof considerable length, and great difiiculty is found in oper- 4 ating the device wh'ereit' must be operated in a small space. v

It is obvious that considerable leverage is necessary to form the screw-threads on the pipe, and it is therefore desirable to have the handle structures embodied as part of the regular construc- 1 tion are now known, but they are very.ex-,

pensive as compared with the device above described.

It is my purpose to provide an attachment, whereby a simple ratchet wrench may be employed and the advantage of the ratchet structure secured without adding the large expense necessary to make a ratchet pipe threading device of the ordinary conwill register with each other and receive a locking pin 21. I

On the outer end of the cylindrical rod 20 is a right-angled extension 22, angular in outline, as shown in Figure 1. The pin 21 85 The pipe threading devices with ratchets 106 The rod 20 and the walls ofthe and the holes in the rod 20 and the member 19 are soarranged that when the device is installed. the extension 22 is arranged parallel with the main axis ofthe device and projecting away from there beyond the pipe threading device, as illustrated in the drawings in Figure 1.

The extension 22 is designed to receive anordinary ratchet wrench 23, having the ordinary handle, and the ratchet structure 24, illustrated for instance in Figure 8.

It will be seen that where my attachment is employed, the ratchet handle may be used and can be moved to any position of rotation around the member 22.

In Figure 2, I have illustrated the pipe threading device equipped with my attachment'arranged adjacent to a ceiling 24- and a side wall 25.

It will be seen that the ratchet wrench handle may beadjusted from its full line position shown in Figure 2 to its various dotted line positions, as illustrated, so that even though a small space is allowed for the movement of the handle, the pipe threading device may be operated for cutting threads and the advantage of leverage retained.

To be sure, the leverage is not as good in some positions of the ratchet handles as in others, but it is always possible to have some substantial leverage action.

Thepeculiar structure of the member 20 and its extension 22 is such as to make it possible to use an inexpensive ratchet wrench with the more inexpensive forms of pipe threading devices in an efficient manner.

It will be seen that my invention consists in the attachment and the combination thereof with other parts.

I claim as my invention:

1. The combination of a pipe cutting device, having a rotatable die head provided with a lateral extending tubular member, an attachment therefore having a portion non-rotatably mounted in said tubular member and an extension projecting away from and beyond the pipe threading device'in a line substantially parallel with the axis-0f the pipe threading device, said extension being angular in outline, and a ratchet wrench mounted on said extension.

'2. In a device of the class described, the combination of a pipe threading device, having a rotatable die head provided with a lateral projecting member, an attachment having a portion fixed to said laterally extending member with its longitudinal axis coinciding with the longitudinal axis of said lateral extending member, said attachment having a right-angled extension projecting away from and beyond said pipe threading device and being angular in cross section,-

and a ratchet wrench mounted on said last described extension.

Des Moines, Iowa, October-13, 1921,

HARRY LYNCH 

